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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd33c0e72c3c77251bd405f26597e7ab98c3e23412d7ab6d0836358ac31924a' 
  AND token = 'X2+R54ip6bVtp5Fat0QTbvdJnzlbrPtehYVtlVX2t1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}